package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.UserLoginDTO;
import com.sky.entity.*;
import com.sky.exception.LoginFailedException;
import com.sky.mapper.*;
import com.sky.properties.WeChatProperties;
import com.sky.service.UserService;
import com.sky.utils.HttpClientUtil;
import com.sky.vo.DishVO;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import javax.swing.plaf.nimbus.State;
import java.time.LocalDateTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

@Service
public class UserServiceImpl implements UserService {

    private static final String WX_LOGIN = "https://api.weixin.qq.com/sns/jscode2session";

    @Autowired
    private WeChatProperties weChatProperties;
    @Autowired
    private UserMapper userMapper;
    @Autowired
    private CategoryMapper categoryMapper;
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private DishFlavorMapper dishFlavorMapper;
    @Autowired
    private SetmealMapper setmealMapper;

    /**
     * 微信登录
     * @param userLoginDTO
     * @return
     */
    @Override
    public User wxLogin(UserLoginDTO userLoginDTO) {
        //调用微信接口服务，获得当前微信用户的openid
        String openid = getOpenid(userLoginDTO.getCode());

        //判断openid是否为空，如果为空则表示登陆失败，抛出业务异常
        if (openid == null) {
            throw new LoginFailedException(MessageConstant.LOGIN_FAILED);
        }

        //判断当前用户是否为新用户
        User user = userMapper.getByOpenid(openid);

        //如果时新用户，自动完成注册
        if (user == null) {
            user = User.builder()
                    .openid(openid)
                    .createTime(LocalDateTime.now())
                    .build();
            userMapper.insert(user);
        }

        //返回这个用户对象
        return user;
    }

    /**
     * 分类查询
     * @param type
     * @return
     */
    @Override
    public List<Category> list(Integer type) {
        List<Category> list = categoryMapper.list(type);
        return list;
    }

    /**
     * 根据分类id查询菜品
     * @param categoryId
     * @return
     */
    @Override
    public List<DishVO> getDishesByCategoryId(Long categoryId) {
        //根据分类id查询菜品
        Dish dish = Dish.builder()
                .categoryId(categoryId)
                .status(StatusConstant.ENABLE)
                .build();
        List<Dish> dishList = dishMapper.list(dish);

        List<DishVO> list = new ArrayList<>();
        //根据菜品id查询口味
        for (Dish d : dishList) {
            List<DishFlavor> dishFlavors = dishFlavorMapper.getByDishId(d.getId());
            //将菜品和口味封装到VO对象里面
            DishVO dishVO = new DishVO();
            BeanUtils.copyProperties(d, dishVO);
            dishVO.setFlavors(dishFlavors);
            //将VO对象放入集合里面
            list.add(dishVO);
        }
        return list;
    }

    /**
     * 根据分类id查询套餐
     * @param categoryId
     * @return
     */
    @Override
    public List<Setmeal> getSetmealsByCategoryId(Long categoryId) {
        List<Setmeal> list = setmealMapper.getByCategoryId(categoryId);
        return list;
    }

    /**
     * 根据套餐id查询包含的菜品
     * @param setmealId
     * @return
     */
    @Override
    public List<Dish> getDishListBySetmealId(Long setmealId) {
        List<Dish> list = dishMapper.getBySetmealId(setmealId);
        return list;
    }


    /**
     * 调用微信接口服务，获得当前微信用户的openid
     * @param code
     * @return
     */
    private String getOpenid(String code){
        //调用微信接口服务，获得当前微信用户的openid
        Map<String, String> map = new HashMap<>();
        map.put("appid",weChatProperties.getAppid());
        map.put("secret",weChatProperties.getSecret());
        map.put("js_code",code);
        map.put("grant_type","authorization_code");
        String josn = HttpClientUtil.doGet(WX_LOGIN, map);

        JSONObject jsonObject = JSON.parseObject(josn);

        return jsonObject.getString("openid");
    }
}
